The Apple Communication Slot is an internal expansion data interface (slot) found in Apple Macintosh computers from the early to mid 1990s. It is used to add communication expansion cards like network adapter or modem

Modem

A modem is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data...

 to Mac

Macintosh

The Macintosh , or Mac, is a series of several lines of personal computers designed, developed, and marketed by Apple Inc. The first Macintosh was introduced by Apple's then-chairman Steve Jobs on January 24, 1984; it was the first commercially successful personal computer to feature a mouse and a...

s and Power Macs.

A major complaint about this design is that when a modem card is installed in the Communication Slot of a Power Macintosh G3

Power Macintosh G3

The Power Macintosh G3, commonly called "beige G3s" or "platinum G3s" for the color of their cases, was a series of personal computers designed, manufactured, and sold by Apple Computer, Inc. from November 1997 to January 1999...

, the modem serial port on the back of the computer is disabled. 6200 series computers that came with this card installed had the modem port blanked out (though the connector was still present).

Communication Slot

A Communication Slot (some documentation refers to this as a Communication Card I Slot) is found in some 68040 and PowerPC CPU Macs.

• Macintosh 575 family
• Macintosh 630 family
• Macintosh 5200 family
• Macintosh 5300 family
• Performa 6200CD series
• Performa 6300 series (except 6360)

Communication Slot II

The Communication Card II was used in the 6360 and later series of Power Macs and Performas.

• Power Macintosh/Performa 6360
• Power Macintosh/Performa 5400 series
• Power Macintosh/Performa 5500 series
• Power Macintosh/Performa 6400 series
• Power Macintosh/Performa 6500 series
• Power Macintosh 4400 (aka Power Macintosh 7220)
• Twentieth Anniversary Macintosh

Communication Slot cards

• 14.4 modem Macintosh Express Fax/Modem (Part M2480LL/A)
• 10Base-T Apple Ethernet CS Twisted Pair Card (Part M3065Z/A)
• 10Base-2 Apple Ethernet CS Thin Coax (coax cable) Card (Part M2708Z/A)
• AUI Apple Ethernet CS AAUI Card (Part M3066Z/A)

Communication Slot II

• 28.8 kbit/s Global Village or Apple GeoPort modem
• 10BASE-T
  10BASE-T
  Ethernet over twisted pair technologies use twisted-pair cables for the physical layer of an Ethernet computer network. Other Ethernet cable standards employ coaxial cable or optical fiber. Early versions developed in the 1980s included StarLAN followed by 10BASE-T. By the 1990s, fast, inexpensive...
  
   Apple EtherNet CS II Twisted-Pair Card (Part M4772ZM/A; Order 661-1171)
• 10BASE-2 (thin coax) Ethernet Card (Part M4773ZM/A)
• AAUI (Apple standard) Ethernet Card (Part M4774ZM/A)

External links

• http://docs.info.apple.com/article.html?artnum=15081
• http://pinouts.ru/Slots/commslot_pinout.shtml